// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/compositor/onscreen_display_client.h"

#include "base/debug/trace_event.h"
#include "cc/output/output_surface.h"
#include "cc/surfaces/surface_factory.h"
#include "cc/surfaces/surface_manager.h"
#include "content/browser/compositor/surface_display_output_surface.h"
#include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
#include "content/common/host_shared_bitmap_manager.h"

namespace content {

OnscreenDisplayClient::OnscreenDisplayClient(
    scoped_ptr<cc::OutputSurface> output_surface,
    cc::SurfaceManager* manager,
    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
    : output_surface_(output_surface.Pass()),
      display_(new cc::Display(this,
                               manager,
                               HostSharedBitmapManager::current(),
                               BrowserGpuMemoryBufferManager::current())),
      task_runner_(task_runner),
      scheduled_draw_(false),
      deferred_draw_(false),
      pending_frames_(0),
      weak_ptr_factory_(this) {
}

OnscreenDisplayClient::~OnscreenDisplayClient() {
}

bool OnscreenDisplayClient::Initialize() {
  return display_->Initialize(output_surface_.Pass());
}

void OnscreenDisplayClient::CommitVSyncParameters(base::TimeTicks timebase,
                                                  base::TimeDelta interval) {
  surface_display_output_surface_->ReceivedVSyncParameters(timebase, interval);
}

void OnscreenDisplayClient::DisplayDamaged() {
  if (scheduled_draw_ || deferred_draw_)
    return;
  TRACE_EVENT0("content", "OnscreenDisplayClient::DisplayDamaged");
  if (pending_frames_ >= display_->GetMaxFramesPending()) {
    deferred_draw_ = true;
  } else {
    ScheduleDraw();
  }
}

void OnscreenDisplayClient::ScheduleDraw() {
  DCHECK(!deferred_draw_);
  DCHECK(!scheduled_draw_);
  scheduled_draw_ = true;
  task_runner_->PostTask(
      FROM_HERE,
      base::Bind(&OnscreenDisplayClient::Draw, weak_ptr_factory_.GetWeakPtr()));
}

void OnscreenDisplayClient::OutputSurfaceLost() {
  surface_display_output_surface_->DidLoseOutputSurface();
}

void OnscreenDisplayClient::Draw() {
  TRACE_EVENT0("content", "OnscreenDisplayClient::Draw");
  scheduled_draw_ = false;
  display_->Draw();
}

void OnscreenDisplayClient::DidSwapBuffers() {
  pending_frames_++;
}

void OnscreenDisplayClient::DidSwapBuffersComplete() {
  pending_frames_--;
  if ((pending_frames_ < display_->GetMaxFramesPending()) && deferred_draw_) {
    deferred_draw_ = false;
    ScheduleDraw();
  }
}

void OnscreenDisplayClient::SetMemoryPolicy(
    const cc::ManagedMemoryPolicy& policy) {
  surface_display_output_surface_->SetMemoryPolicy(policy);
}

}  // namespace content